參考：https://blog.csdn.net/jasonliujintao/article/details/77531519

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              #coding:utf-8
from time import sleep
from threading import Thread

def async(f):
    def wrapper(*args, **kwargs):
        thr = Thread(target=f, args=args, kwargs=kwargs)
        thr.start()
    return wrapper

class A():

    def __init__(self):
        self.num=1

    @async
    def A(self):
        sleep(5)
        self.num=8
        print("a function {}".format(self.num))

    def B(self):
        self.num=3
        for i in range(10):
            sleep(1)
            print("b function {}".format(self.num))

if __name__ == '__main__':

    a=A()
    a.A()
    a.B()